Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 3,321	$ (7,504)
Adjustments to reconcile net income (loss) to net cash provided (used) by operating activities:
Depreciation	8,818	8,642
Net provision for losses (recoveries) on advances and guaranteed loans to suppliers	1,290	(113)
Foreign currency remeasurement (gain) loss, net	(5,917)	9,642
Other, net	(1,944)	8,079
Changes in operating assets and liabilities, net	(122,647)	(2,690)
Net cash provided (used) by operating activities	(117,079)	16,056
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of property, plant and equipment	(6,356)	(7,303)
Proceeds from sale of property, plant and equipment	206	252
Net cash used by investing activities	(6,150)	(7,051)
CASH FLOWS FROM FINANCING ACTIVITIES:
Issuance (repayment) of short-term debt, net	(16,058)	5,782
Dividends paid on convertible perpetual preferred stock	0	(3,687)
Dividends paid on common stock	(13,649)	(12,040)
Other	(2,827)	(2,250)
Net cash used by financing activities	(32,534)	(12,195)
Effect of exchange rate changes on cash	375	(170)
Net decrease in cash and cash equivalents	(155,388)	(3,360)
Cash and cash equivalents at beginning of year	283,993	319,447
Cash and cash equivalents at end of period	$ 128,605	$ 316,087